18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter Made from high-quality aluminum

Made from high-quality aluminum

With a 5" diameter for the duct opening measurement

+ Product Details Size - 26"w X 12"h is the size for the duct opening measurement only

ensuring even air distribution throughout your space

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18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter Made from high-quality aluminum+ Product Details Size 18" x 30" or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 31. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing